1. Heartburn is a burning sensation behind the breastbone. Unlike the name says heartburn has absolutely nothing to do with the heart. It is problem caused by the digestive system. The main type of heartburn is called Angina. It is caused by temporary shortage of oxygen being carried in the blood to the heart muscle. Heartburn occurs when small amounts of acid rise up into the esophagus. Unlike the stomach the esophagus does not have an extra lining in it so when it is exposed to acid it becomes painful and inflamed. The reason that heartburn relates to the pH scale is because of acids. Acids are one of the main causes of heartburn and acids are measured with pH scales. If the acid has a very low pH level than the heartburn can become much more severe.

2. PH is a measure of acidity or alkalinity. PH tests can be done on soil or swimming pools.

Danger ... Nitric Acid

Copper mining and sulfuric acid plant, Copperhill]...

English: From the EPA website on acid rain http://...

An esophageal pH test measures how often stomach acid flows into the lower esophagus and the degree of acidity during a 12-24 hour period. PH tests are important because they can evaluate whether you are suffering from heartburn, difficulty swallowing food or liquid and chest pain.

3. I) The acidity level of the grass in Japan is between 4.2 and 5.5 and it also lacks the adequate amount of calcium, phosphates and magnesium. Because the grass lacks calcium it isn't good for raising horses with strong bones. The low acidity level also causes damage to the horse because the horse can't consume an adequate amount so that he can properly digest his food.

II) Acid foods are not determined by their pH level but the pH of the food once your body absorbs it. For example: a lemon is really acidic...

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6 pages40Feb/20044.0

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